Alera Wrigley Series High Performance High-Back Synchro-Tilt Task Chair, Supports 275 Lb, 17.24" To 20.55" Seat Height, Black Designed to last in the busy office with smart ergonomic features for optimal comfort and performance. Synchro-tilt mechanism allows back to recline in a 2-to-1 ratio to the seat to help keep your feet on the ground even when leaning back. Waterfall seat edge reduces pressure at the back of knees. Padded adjustable arms are width and height adjustable. Impact-resistant molded plastic back shell. Durable fabric upholstery is tested for longevity and resists fading. Five-star base with casters for easy mobility. Our Price Buys you: 1